Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 336: | \[{21^{336}-1\over20}\] | 24 × 11 × 13 × 17 × 29 × 43 × 61 × 73 × 113 × 193 × 337 × 421 × 433 × 463 × 617 × 631 × 673 × 3181 × 3319 × 3697 × 4789 × 6427 × 12097 × 18481 × 62897 × 97241 × 300673 × 912521 × 1001713 × 7658113 × 25392481 × 81867661 × 227633407 × 518118697 × 68454248717<11> × 115593326297<12> × 266902182961<12> × 831380909129<12> × 22864311556633<14> × 31548272195219921<17> × 2934413293238858072198024161<28> × 67888223448153422105362819002556545290401<41> × 1432367584775648032290819051792496005705116017<46> × 2774300000368737687891868483184052563250138593521153<52> × 3089575926780444770383361777867483120304250370709405228977775262458885251137<76> |